—Do you know when World Non-smoking Day is?—_____________.
--- Sorry ,I can't sing English songs?--- ___. I'll teach you.
There is _________ swimming pool in front of Jhon's house.
--What can you see on the table?–We can see four ___ and six ______.
Mary came ______in the Chinese exam. This is _______time she got the good mark.
Six million, six hundred and sixty-six thousand, six hundred and sixty-six is________.